Q: Hi, I'm 28 years old male. My vision is as follows: Right - (-0.5 spherical, -0.75 cyl, 080 axis) Left - (-0.75 spherical, -0.75 cyl, 112 axis) I work on computers 10-12 hrs a day. That took a toll on my vision. I have difficulty driving at night, particularly when I don't know the area. I feel lot of stress and tension in my muscles in forehead. Massaging the scalp helps it a little. I can feel my eye lids twitching towards end of the day. Will vision correction ( and lasik in particular) help my tension/stress in forehead? thank you, Vishu A: Vision correction will certainly help your vision, particularly at night. If your tension/stress in the forehead is due to straining to see, then vision correction will help that. Andrew Caster, MD

Q:  From an objective, statisical standpoint, do you think there is a greater chance of post operative follow-on treatment and complications using microkeratone procedure versus the all lazer Intralase? One of the doctors I'm considering uses only the microkeratone procedure. He feels it's safer than the all lazer. Thank you. A: I personally prefer the microkeratome for most situations. Andrew Caster, MD

Q: Dear Caster, Can the custom lasik laser gives the patient cancer after many years.Does the reshaped cornea ever change shape? A: Custom Lasik cannot cause cancer. The shape can change, and Lasik will not stop it from changing. Andrew Caster, MD

Q: Dear Dr. Caster, I just have 1 last question. Can the surrounding stroma cells be damage after lasik. Can the damage cells regenerate? If it's able to regenerate, will that mess up the cornea curvature? Thanks A: The surrounding cells are not damaged during Lasik. Andrew Caster, MD

Q: Hello Dr Caster, Well, I can't quite believe this will actually get to you, but if you're reading this, then wow, that's great! I have one simple question. I live in London and only one clinic performs Lasik with intralase. Is using a laser to cut the cornea better than a microkeratome? The internet postings are quite conflicting on the matter, but as an expert, what is your take on the topic? I'd be most grateful for your help. Thanks so much, Yours, Sheridan A: There is controversy as to which is better, the keratome or IntraLase. In any event, they are very similar. I personally prefer the keratome. Andrew Caster, MD Caster Eye Center Beverly HIlls, California

Q: I am very interested in having Lasik for my near sighted eyes with mild astigmatism (-6.75 in each eye). I have hypertrophic scarring, though, (not actual keloids) and have been told by a surgeon 6 years ago that I couldn't have it done because of my scarring. Have any of you done lasik on pts with keloids or hypertrophic scarring? I really want to have it done, but do not want to go blind. flikfick@hotmail.com A: The current knowledge is that keloid formers or hypertorphic scarring patients can have Lasik without additional risk. Andrew Caster, MD

Q: Can a person with nystagmus, amblyopia, and high astigmatism a candidate for lasik surgery? A: Possibly. It would depend on the exact situation. Andrew Caster, MD

Q: What happens if you switch between wearing your contact lenses and glasses before the intial consultation? A: The treatments are best performed with your eye in its natural state, after the effect of contacts (which push on the eye) have worn off. So it is great to switch out of your contacts prior to the intial consultation. Andrew Caster, MD

Q: Hi, thank you for taking the time to read this email. I'm very interested in fixing my nearsightedness with one of these procedures but I'm wary for two reasons. First, I have noticed lately (last year or so) that my eyes have become more sensitive to light. I will retain a high contrast image for several seconds sometimes. I'm wondering if this is a condition of some sort and if it would affect my candidacy for corrective surgery. Secondly, I've used contacts off and on for 13 years. After a few years of using them I noticed that whenever I put them in, my eyes would almost instantly become tired and later that day when I took them off, I would be much more tired. A little about myself: I'm 27, male, white, my grandfather died of diabetes, however I've never been diagnosed with it. I'm in front of a computer for work, and often for fun. thanks again! Nate. A: Sensitivity to light, as you describe, is probably a variation of normal, but an exam is needed. Also, many people get tired with the contacts on. Right now, I don't see anything to prevent you from being a good candidate. Andrew Caster, MD

Q: Dear Dr. Caster, I just had lasik consultation. The doctor told me since I had lasik done 3 yrs. ago,they might do a PRK instead of custom. He said that the surgeon might have problem with reopening the flap since it's been 3 yrs.Is PRK as good as custom lasik? Thanks. A: PRK takes longer to heal, but is otherwise just as good. I would suggest that you see the surgeon regarding this issue. Andrew Caster, MD